SPOT COLOR SUBSTITUTION FOR DIGITAL WATERMARKING
First Claim
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1. A digital watermark embedding method comprising:
- obtaining data associated with a spot color Sa, the spot color Sa comprising a component of a color design;
using one or more configured processors, determining a screen Ss of the spot color Sa;
selecting a substitute spot color candidate Sb1 by;
i) evaluating color distance or color error between the substitute spot color candidate Sb1 and the screen Ss, and ii) evaluating brightness of the substitute spot color candidate Sb1 and the screen Ss;
using one or more configured processors, determining a Cyan (C), Magenta (M) and Yellow (Y) process color tint that when combined with the substitute spot color candidate Sb1 approximates the spot color Sa;
transforming a determined CMY process color tint with a digital watermark signal to embed the digital watermark signal in the CMY process color tint, said transforming yielding a watermarked CMY process color tint; and
combining the watermarked CMY process color tint and the substitute spot color candidate Sb1, said combining yielding a digital watermarked substitute spot color.
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Abstract
The present disclosure relates generally to digital watermarking for spot colors. In one implementation a substitute spot color+CMY tint is selected to replace an original spot color. The CMY tint can be transformed to carry a digital watermark signal. Of course, other features, combinations and technology are described herein.
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Citations
20 Claims
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1. A digital watermark embedding method comprising:
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obtaining data associated with a spot color Sa, the spot color Sa comprising a component of a color design; using one or more configured processors, determining a screen Ss of the spot color Sa; selecting a substitute spot color candidate Sb1 by;
i) evaluating color distance or color error between the substitute spot color candidate Sb1 and the screen Ss, and ii) evaluating brightness of the substitute spot color candidate Sb1 and the screen Ss;using one or more configured processors, determining a Cyan (C), Magenta (M) and Yellow (Y) process color tint that when combined with the substitute spot color candidate Sb1 approximates the spot color Sa; transforming a determined CMY process color tint with a digital watermark signal to embed the digital watermark signal in the CMY process color tint, said transforming yielding a watermarked CMY process color tint; and combining the watermarked CMY process color tint and the substitute spot color candidate Sb1, said combining yielding a digital watermarked substitute spot color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A digital watermark embedding system comprising:
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an input to receive color data; memory comprising data associated with a spot color Sa, the spot color Sa comprising a component of a color design; one or more processors configured for;
generating a screen Ss of the spot color Sa;means for evaluating substitute spot color candidates to select a substitute spot color candidate Sb1 including;
i) means for evaluating color distance or color error between the substitute spot color candidate Sb1 and the screen Ss, and ii) means for evaluating brightness of the substitute spot color candidate Sb1 and the screen Ss;in which said one or more processors are configured for;
determining a CMY process color tint that when combined with the substitute spot color candidate Sb1 approximates the spot color Sa;means for embedding a digital watermark signal in the CMY process color tint, said means for embedding producing a digital watermarked CMY process color tint; and in which said one or more processors are configured for;
merging the watermarked CMY process color tint and the substitute spot color candidate Sb1, the merging yielding a digital watermarked substitute spot color. - View Dependent Claims (12, 13, 14, 15)
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16. A digital watermark embedding method comprising:
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obtaining data associated with a first spot color Sa, the first spot color Sa comprising a component of a color design; determining a plurality of substitute spot color candidates Sb1-Sbi, where i is an integer, by evaluating—
for each substitute spot color candidate—
color distance metrics between data associated with the substitute candidate spot color and the data associated with the first spot color Sa;determining a Cyan (C), Magenta (M) and Yellow (Y) tint for each of the plurality of substitute spot color candidates Sb1-Sbi; using one or more electronic processors, simulating an overprint of each of the plurality of substitute spot color candidates Sb1-Sbi with its respective CMY tint, and for each of the overprinted substitute spot color candidates, generating an Lab or Chroma distance metric relative to the first spot color Sa; based on generated distance metrics, determining final spot color candidates; for at least one of the final spot color candidates, and using one or more electronic processors, transforming its respective CMY tint with a digital watermark signal; and substituting the at least one of the final spot color candidates plus its transformed CMY tint for the first spot color Sa in the color design. - View Dependent Claims (17, 18, 19, 20)
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Specification